Recording and computing machine



Nov. 29, 1949 E. o. oGG NsTEm ET AL 2,489,724

RECORDING AND COMPUTING MACHINE 9 Sheets-Sheet 1 Filed Feb. 12, 1946 Ila/1711,

I. m w wh 0 m2 Y! g III/0mm E INVE NTORS K.) ROGGENSTEIN L 5.5 THIERFELDE R BY v 2 a 2 AGE NT Nov. 29, 1949 E, 0. ROGGENSTEIN ET AL RECORDING AND COMPUTING MACHINE 9 Sheets-Sheet 2 Filed Feb. 12, 1946 INVENTORS E.O. ROGGENSTEIN E.F' THIERFELDER AGENT Nov. 29, 1949 E. o. ROGGENSTEIN ET AL RECORDING AND COMPUTING MACHINE 9 Sheets-Sheet 3 Filed Feb. 12. 1946 INVENTORS E. O. ROGGENSTEIN E. F. THIERFELDER AGENT Nov. 29, 1949 E. o. ROGGENSTEIN ET AL 2,439,724

RECORDING AND COMPUTING MACHINE 9 Sheets-Sheet 5 Filed Feb. 12, 1946 FIG. 5

NVEN ORS E.O. ROGGENSTEIN E5 THIERFELDER wufiiy jw "SENT Nov. 29, 1949 E. o. RQGGENSTEIN ET AL 2,489,7 4

RECORDING AND COMPUTING MACHINE Filed Feb. 12, 1946 9 Sheets-Sheet 6 INVENTORS E.Q ROGGENSTEIN E F THIERFELDER AGENT Nov. 29, 1949 9 Sheets-Sheet 7 Filed Feb. 12. 1946 AGENT Nov. 29, 1949 E. O. ROGGENSTEIN ET AL 2,489,724

RECORDING AND COMPUTING MACHINE Filed Feb. 12, 1946 9 Sheets-Sheet 9 #R w s NEMHEE s o 5 a J m4 IO YN (K 0 2w u U E, E i o 2 M mm. E u OZEOFMUK INVENTORS EF THIERFELDER AGENT N E T S N E G G 0 R E w E :5 oo

Patented Nov. 29, 1949 UNITED STATES PATENT OFFICE RECORDING AND COMPUTING MACHINE Edwin 0. Roggenstein and Emil F. Thierfelder, Ilion, N. Y., assignors to Remington Rand Inc., Buffalo, N. Y., a corporation of Delaware Application February 12, 1946, Serial No. 647,134

26 Claims. 1

This invention relates to recording and computing machines and more particularly to accumulator actuator mechanisms and features associated therewith.

Heretofore, recording and computing machines such as the Remington type disclosed herein employed actuator mechanisms of the form shown and described in U. S. patent to Wahl 1,270,471, issued June 25, 1918. This form of actuator mechanism is operable under control of numeral keys which, when depressed, actuate intricate and costly linkages including the well known goose necks which in turn actuate the usual sector gear. Each time an entry is made this sector gear is adapted to move into and out of mesh with a train of gears increasing the possibility of error.

In addition to the above intricate and costly actuator mechanism, the above type of recording and computing machine employs a front cam shaft such as is disclosed in U. S. patent to Hart 2,063,737, issued December 8, 1936. This front cam shaft has mounted thereon a cam for each numeral key, ten in number, and a one revolution clutch mechanism for each cam. Upon depression of a numeral key, its corresponding clutch mechanism is released to effect the rotation of its associated cam for one complete revolution thereby causing the entering of the amount in the accumulator and printing said amount. It will be seen that the cost of manufacturing and servicing this type of cam shaft assembly and its allied mechanisms is considerable.

Therefore, the principal object of the present invention is to simplify the construction of the above type of recording and. computing machine, to greatly improve the operation of said machine and, moreover, to reduce the cost of its manufacture.

Another object of this invention is to simplify and improve the actuator mechanism in a manner to more simply and accurately enter amounts in the accumulator.

Still another object of this invention is to improve the accuracy of the actuator mechanism by retaining the actuator gear train in mesh at all times.

Still another object of this invention is to eliminate the use of separate and distinct power drive mechanisms for each numeral key.

Another object is to enable operation of the actuator mechanism, printing mechanism, escapement mechanism, and the restoring mechanism of the machine by the use of a single power drive clutch mechanism. effective upon the operation of any one of the numeral keys.

In carrying out the above objects, the present invention provides a single cam unit consisting of four cams which, upon depression of any numeral key, are effective to control various machine functions namely, entering of the amount corresponding to the numeral key depressed, conditioning the actuator mechanism whereby an amount may be entered only during a predetermined part in the machine cycle, spacing the carriage, and restoring the various mechanisms to normal position. The entering or add cam is operable to control the operation of an epicyclic gear train which includes a sun gear, a planet gear, an internal gear, and an external gear which is in continuous driving connection with the usual master wheel. The locking cam controls the movement of locking and unlocking means associated with the sun gear and master wheel in a manner to first unlock the master wheel and lock the sun gear during the amount entering part of the cycle in order to permit the epicyclic gear train to rotate the master wheel an amount corresponding to the numeral key depressed and, second, to lock the master wheel and unlock the sun gear during the restoring part of the cycle to permit the sun and planet gears to return to normal position without effecting movement of the internal and external gears and the master wheel. lhe space cam is operable to control the escapement of the carriage to the next step for the next entering cycle of the machine. The restoring cam is operable to restore the various mechanisms actuated upon the movement of any numeral key.

Other objects and structural details of the present invention will be apparent from the following description when read in connection with the accompanying drawings wherein:

Figs. 4 and 5, when taken together represent a front to rear top partial plan view of the power base portion of the machine disclosing the cam unit and its associated mechanism;

Fig. 6 is an exploded isometric view of parts of the key controlled slides and their associated differential limiting members;

Fig. 7 is a diagrammatic view of the entering or add cam and its associated mechanism in normal position;

Fig. 8 is a diagrammatic view of the locking and unlocking cam and its associated mechanism in normal position; i

Fig. 9 is a partial'view similar to Fig. 8 disclosing the locking and unlocking master gear pawl in its operated position;

Fig. 10 is a detail view disclosing the mechanism associated with the sun .gear locking pawl in normal position;

Fig. 11 is a detail view similar'to Fig. 10 but in operated position;

Fig. 12 is a diagrammatic view disclosing the space cam and its associated'mechanism in normal position;

Fig. 13 is a diagrammatic view disclosing the restoring cam and its associated mechanism in normal position;

Fig. 14 is a diagrammatic view disclosing the mechanism for releasing the clutch dog latch associated with the cam unit;

Fig. 15 is a timing chart;

Fig. 16 is an enlarged detail view of a portion of the actuating slides with one of the slides in actuated position;

Fig. 17 is a view similar to Fig. 16 with the actuated slide moved to a position beyond its normal latched position.

The invention described herein is shown embodied in a recording and computing machine of the type shown and described in the above mentioned Patent No. 2,063;737. However, while the invention is herein embodied in the above type of machine, it will be'understood that the same may be used in connection with any type of recording and computing machine without departing from the scope of the invention. Only so much of the old machine is herein shown and described as is consistent with a clear understanding of the invention.

General machine Referring particularly to Fig. 1, the present machine includes a platen H type bars i I, sub levers l2 connected to levers l3 which are pivoted on one end on a channel bracket l4'and at the other'end are provided with pivoted depending snatch pawls l5 adapted. to be swung into engagement with the usual power driven snatch roll Hi. When the snatch pawl I5 is released to engage the snatch roll IS in a manner to be described, its associated type bar II is actuated to printeither-alphabet or numeral letters in accordance with the particular key depressed. The typewriter mechanism is mounted in a frame I! which is pivoted at the rear of the machine in the usual manner to a lower power base frame Key operation of power shaft As is best seen in Figs. 1, 4, and 5, each of the numeral key levers 20 are pivoted at their rear ends on channel bracket l4 and are provided at their forward ends with depending levers 2!. The levers 2| are pivoted at 22 and are urged in a counter-clockwise direction by a spring 23, one end of which is connected to the lever 2| and the other end connected to a pin 24 on the numeral lever 20. A pin 25 on the lever 20 limits the counter-clockwise movement of its associated lever 2!. The extreme lower portion of each of the levers 2| are provided with a bent over lug 25 which lies in the same vertical plane as a shoulder 21 formed upon the forward end of an associated lever 28. Each lever 28 is formed with an additional shoulder 3E1 adapted to be engaged by a pin 3! mounted upon an associated slide 32 so as to limit the forward movement of said slide. The levers 2B are rotatably mounted in suitable space relation upon .a crossshaft 33 mounted at its ends in a casting 134, secured to the inner sides of the left and right hand walls of the power base frame 58. Individual springs 35 having one end connected to a plate 36 secured to the casting 3d and the other end connected to pins 31 on the levers 28 serve to urge the levers in a clockwise direction. The slides 32 are guided for'front to rear movement in slots 38 formed on the casting 34 and are limited in such front to rearmovementbymeans of a pair of cross rods 40 which pass through elongated slots 4| in the slides32. In order that the cross rods 69 may be held against any displacement, the. rods fit into notches 32- formed in the combportion of" casting 34 andare clampedin said notches by 'means of suitable clamps '43 secured'to the upper-portion of casting 34. Each of the slides"Share-resiliently urged forwardly by means of a spring '44 having one end-'connectedto aplate lfi'secured to the casting and the other'end'connectedto the slide 32; The above construction is such that upon depressionof a-nmneralkeyL-Eythe bent over portion 2601" its associated lever 2i engages the shoulder 2". of its associatedlever '28 to rock" said lever about its-pivot 33 againstthetension of spring 35. -When the lever'28 is thus-rocked its shoulder 31? moves out of the path of the pin3l -of-its associated slide 32 to-permit-said-slide to move'forwardly due to'the tension of itsspring 44. The above slides 32 are adapted to move forwardly to theireffective position and rearwardly to-the restored'position 'oncefor each cycle of the machine to control the 'various machine'iunctions.

In order to effect an immediate fullrestoration of the lever 28-so-as'to be inposition" to latch its associated slide -whensaid slide-is restored to its normal rearward-position, the forward --end 2|, in a clockwise direction against the tension of its spring 23, out of the path of shoulder 21. This action takes place atabout-the'time the numeral lever 2% is in its 'full'depressed position. It will be seen from-the above that the key lever 28 may be retained in its-lowered-position a length of time somewhat beyond that which is necessary to release its associated slide while permitting its associated lever 28 to' be restored to its latching position.

It is possible that, before the complete restoration of the slide 32 to its fully latched position iseifected, the operator may accidently-again depress the numeralkeyZli'thereby rocking its associated lever 28 out of'the path of-latchpin 3i, causing the slide to again move: forwardly to start; a repeat izope'ration-cof the machine. In

-'order'to avoi'd thisgthe present machine is proof the levers 8 are pivoted on. acrossshaft 52 secured at its ends to the left and right side walls of the power base frame l8 and are resiliently urged in a counter-clockwise direction by means of individual springs 53 one end of which are connected to a cross plate 54, suitably secured to the front wall of the power base frame 18, and the other end connected to pins 55 on levers 68. The levers 48 are limited in their counter-clockwise movement by the cross plate 54.

The above construction is such that upon depression of a numeral lever 26 the pin 5| on lever 2| engages and moves its associated lever #38 in a clockwise direction against the tension of its spring 53. When the slide 32 is released, in the manner described above, its pin ll will engage and move its associated lever 2| in a clockwise direction thereby moving its pin 55 out of contact with the upper edge of the rearward end of its associated lever 58. This causes the lever 48 to rock slightly counter-clockwise, due to the tension of its spring 53, until its shoulder 58 engages the pin 5! preventing the lever ill from returning to its normal upright position. It will be seen that during the time the lever 2! is thus latched, operation of the key lever 28 will not effect movement of its associated lever 28 and a repeat forward movement of its slide 32 is thereby prevented. The pin 5| is not disengaged from shoulder 53 until slightly prior to the full restoration of the numeral lever at which time the lever M is rocked to its normal upright position due to the tension of its spring 23.

In order to prevent a second key lever from being operated before the first is fuly restored to its normal position, the forward end of each of the slides 32 is provided with a cam portion 51. Cooperating with the cam portion 5'! is a pin 58 mounted upon an arm 60 secured to a cross shaft 6! suitably journaled at its ends in the left and right side walls of the power base frame l8. Also secured to the shaft (SI and located near its left end thereof is a two arm lever, the upright arm 52 of which is resiliently connected to another arm 63 by means of a spring 64 having one end connected to a pin on the arm 62 and the other end connected to a pin on the arm 63. The arm as is loosely mounted on shaft 6! and has the upper portion thereof directly in line with the lock balls 65 of the usual ball lock mechanism employed in the present type of machine. The other arm 66 of the two arm lever has connected at its lower portion one end of a spring 51 the other end of which is suitably connected to front frame wall of the power base frame it. The above construction is such that when a slide 32 moves forwardly upon operation of its corresponding numeral key 20, the cam surface 5'! acts to rotate the arm 62 in a counter-clockwise direction and through the spring 64 draws the upper portion of arm 63 to a position between two of the balls 85 to prevent the operation of another key in the usual manner.

In order to effect the rotation of the cam unit, to perform the various functions of the machine, the rearward end of each of the slides 32 pro vided with a stud ill which, when the slide moves forward as above described, engages a depending arm ll of a four-arm lever 12 loosely mounted on a cross shaft is journaled at its ends in brackets i l (one shown) secured to the inner sides of the left and right hand walls of the power base frame 18. Another arm 15 of the lever 12 has connected thereto one end of a link 16 which link is connected at its other end to one arm of a lever 1! pivoted on a cross shaft 18 which is se- 6, cured at its ends in brackets 14. Pivoted to the other arm of lever 11 is a hook adapted to normally engage and retain the snatch pawls l 5 out of engagement with the snatch roll it against the tension of spring 8|. When the four-arm lever T2 is rocked clockwise as above described, the lever Tl through link 16 is rocked in a counter-clockwise direction drawing its hook 8!} forwardly to move its associated snatch pawl 55 into engagement with the snatch roll it in the usual manner. The engagement and disengagement of the snatch pawl i5 with the snatch roll It is old and well known and it is not deemed necessary to describe thi mechanism further herein.

lhe lever 72 is provided with another arm 82 which when the lever i2 is rocked, as above described, engages a bail rod 83 supported at its ends by arms 84 (one shown) loosely mounted upon the shaft l3. suitably connected at its forward end to the bail (see also Figs. 4, 5, and 14) is a rearwardly extending link 85 the rear end of which is connected at 86 to a depending arm 3'! pivotally mounted upon a stub shaft 88 secured to the left hand wall of the frame ll. Connected at 39 to the depending arm ill is a lever 58, one arm of which extends rearwardly and is supported and guided for sliding move ment in a slot formed in a comb plate 9! which plate is rigidly supported upon a cross shaft 92 suitably mounted the left and right frame walls of the typewriter frame ll. The lever is provided with a shoulder 93 adapted when the lever 89 is moved rearwardly to engage upper end of a latch member 84 and rock memher about its pivot which pivot is secured to a forwardly extending bracket es secured to the rear wall of the power base frame is by screws Ell. The latch member 94 is provided with a shoulder 93 which normally enga and retains a clutch dog l out of engagement with the tooth of a clutch member it! suitably secured to a continuously rotating power shaft I 32 journaled at its ends in the left and right hand frame walls of the power base frame IS. The clutch dog its is resiliently urged in a counter-clockwise direction in the usual manner to engage with a tooth on clutch member Hi: and is pivoted upon a stud m3 suitably secured to a cam unit ld (see Fig. 1) loosely mounted upon the shaft I92. A spring :05 having one end connected to a bracket Hi5 suitably fixed to the bracket Elli and the other end connected to a pin I ill on the latch member 84 serves to urge the latch member 94'. in a counter-clockwise direction.

From the above it will be seen that normaily the latch member through its shoulder as retains the clutch dog Hid out of engagement with the teeth on the clutch member lei, thereby disconnecting the cam unit tea from the con.- tinuously rotating shaft 592. Upon depression of a numeral key, the link 93 is moved rearwardly as above described to disengage the latch member 94* and the clutch dog Hit whereby the clutch dog moves into engagement with a tooth on the clutch member it! to connect the cam unit Hi l with the continuously rotating shaft Hi2.

Near the end of the cycle of operation, the 85 is brought forward to its normal position whereby the latch member 94 through its spring N25 is rocked to its counter-clockwise position in the path of the clutch dog to di ae the uni clutch member lei. A spring :08 having one end connected to the arm 8! and the other end connected to a cross shaft HE! serves to restore the arm 81 and its associated linkage to their forward'normal'position. A spring I II having one end 'connected'to the arm 81 and the other end connected to the forward arm of lever 90 serves to'urge'the rearward end ofsaid lever downwardly into operating relationship with the upper portion of the latch member 94.

Totalizer and actuator mechanism Referring particularly to Figs. 1, 2 and 3, the typewriter frame II supports a carriage upon which is mounted in the usual manner, a totalizer, generally designated by the reference numeral I20, of the type shown and described in the above mentioned patent to Wahl 1,270,471. This totalizer has carrygears I2I which through pinions I22 rotate dial wheels (not shown) a distance corresponding to the number entered- There are a set of these gears and pinions for each denomination of the totalizer. As is well known in the art, the totalizer moves step by step with the carriage so as to bring the carry gears I2I successively into engagement with the usual master gear I23. The master gear I23 issecured to ashaft I24 andis-suitably clutched in the well known mannerto a pairof gears I25 secured to a sleeve I25 which is mounted for sliding movement upon the shaft I25. The gears I25 areassociated with the usual credit balance reversing mechanism including a pinion I2'I secured to a reversing shaft I28 which slides longitudinally back and forth under the influence of the credit balance key or other means not shown. In one position of these elements the shaft I28 is disposed in amanner to drive the master gear I23 in one direction and when the shaft I28 is moved to another positionit will cause a reverse rotavIn the present invention, theabove mentionedv sector gear and associated mechanism as employed in the Patent 1,270,471 is replaced by an annular epicyclic gear train which is continuously in mesh either with one of the gears I25 upon addition, or with the pinion IZ'I upon subtraction. This epicyclic gear trainis operable by a novel actuating mechanism which is under control of the cam unit I04 to effect rotation of the master.

gear I23 in either direction a certain distance in accordance with thelparticular numeral key depressed. The above gear train is mounted upon and located within left and right hand frame walls I30 and I3I respectively, which frame walls are secured to an upright casting I32 by screws I33. The casting I32 is secured by screws I34 to an upright casting I35 secured to the typewriter frame I'I. Located between the two frame walls I30 and I3'I is a third frame wall I35 formed in tegral with the frame walls I35 and HM by means of tie-rods I31. It will be'seen that the frame walls I30, I3I and I36 and the casting I32 form a unitary integral structure which can be easily removed from the machine for repairs or replacement when necessary.

Referring particularly to Figs. 1, 2, and 3, the epicyclic gear train includes a cross shaft I40 journaled at its ends in frame walls I30 and I36 and has securely mounted thereon a sun gear MI 'meral keys 20.

8 1 which is continuously in mesh with a-pair of planetary gears I42. mounted for rotation upon stub shafts I43 secured to an arm I 33 which is mounted for rotation upon the shaft I69 and are continuously in mesh with the teeth I39 of an internal gear I45. The internal gear I35 has teeth I45 formed at its periphery thereof which are adapted to be in mesh with either one of the gears I25 or pinion I2? and is suitably secured to a concentric disk I 38 loosely mounted upon the shaft Iil. The above construction is such that if the sun'gear MI is locked against rotation in a manner later to be described and the arm I35 is rocked in a clockwise direction, the planet gears I52 will revolve epicyclically around the sun gear IQI to effect a clockwise rotation of the internal gear I 55 so as to enter amounts additively or subtractively into the accumulator as the case may be.

Now, if during the return or counter-clockwise movement of the arm Hi l, the master gear I23 is locked against rotation in a manner later to be described and the sun gear is not locked, the internal gear being so locked will cause the planev.tary gears I 32 to return back to normal position end of a link III? which in turn is connected at its rearward end to a depending arm I 55. The arm I28 is secured to .a shaft I55 journaled at its ends in rearward extensions of the casting I32. Loosely connected at I5I to the .link M7 is .an upright link I52 adapted, by means later to be described, to be reciprocated upwardly and downwardly once in each cycle of the machine. It will be noted at this time that items may be entered into the accumulator only during the downward movement of the link I52.

In order to limit thedownward movement of the link I52 so that an amount may be entered in the accumulator corresponding to the particular key depressed, the lower end of the link I52 isconnected at I53 .to another link I54 (see also Fig. 7) which in turn is connected at I55 to a rearwardly extending arm I5? (see also Fig. 4) suitably secured to a cross shaft I58. The cross shaft I58 is jo-urnaledat its ends in left and right hand brackets Ifidfonly one shown) secured to the inner sides of the left and right hand walls of the typewriter frame I? and has securely mounted thereon a plurality of differential arms IISI, ten in number, corresponding to the ten nu- The rearward ends of each of these arms I33 are adapted to cooperate with an associated stop block I52 securely supported between a pair of depending-arms I 53 integral with each other and pivotally supported upon a cross shaft I33 secured at its ends in brackets M. The

lower ends of one of each .pair of the depending arms IE3 is provided with a stud E adapted to engage a slot I65 formed in its. associated slide .32. An eccentric cross rod I57 common to all of the depending arms I53 is adjustably secured at its ends to the brackets Hand serves to limit the coLmter-clockwise movement of the arms I53 when the typewriter-frame I? is swung away from the base frame I8. This eccentric rod It? serves alsoto maintain an alignment between the arms I53and their corresponding slides 32 se that the studs I55 on theuarms may properly enter their respective slots. 555 when the frame I? is swung to theclosed operating position. The above construction is such that upon operation of a nu- The planetary gears I42 are meral key 20 its associated slide 32 moves forward, as above described, to rock its corresponding pair of depending arms I63 in a clockwise direction thereby bringing the stop block I62 thereon directly beneath and in vertical alignment with its associated differential arm IBI. When, during the beginning of a machine cycle, the links I52 and I54 are moved downwardly, in a manner later to be described, the shaft IE8 is rocked clockwise to move all of the differential arms IBI downwardly, until one of these arms limits against its corresponding stop block I52. This downward movement of the above linkage will cause a clockwise rotation of the arm I44 which, through the planetary gears I42 and the sun gear I4I, at this time locked, will cause clockwise rotation of the internal gear I45 to effect rotation of either one of the gears I25 or pinion I21 a distance corresponding to the distance travelled by the differential arms iEI. When, during the latter part of the machine cycle, the links I52 and I54 are moved upwardly, as will hereinafter be described, the arm I44 is rocked in a counterclockwise direction. However, at this time the sun gear MI is free to rotate and the master and internal gears I23 and I45 respectively are locked against rotation whereb the planetary gears I42 and the sun gear I4I will move idly to their normal position.

In order to effect the above mentioned clockwise rotation only of the internal gear I45 during the reciprocatory vertical motion of the arm I44, locking and unlocking means are provided herein for locking the sun gear MI and unlocking the master gear I28 during the start of a machine cycle and locking the master gear I23 and unlocking the sun gear I4I during the latter or restoring part of the machine cycle.

Referring to Figs. 1, 2 and 3, the means for locking and unlocking the master gear I23 includes a pawl I68 pivotally mounted upon a shaft I journaled at its ends in frame plates I3! and I36. The pawl I68 is normally in locked engagement with the master gear I23 and is provided with a cam slot I1! (see also Figs. 8 and 9) within which rides a pin I12 fixed to a forwardly extending arm I13 secured to a shaft I14. The shaft I14 is journaled at its ends in frame plates I81 and I36 and has secured thereon a rearwardly extending arm I15 which is connected by means of a link I18 to another arm l11 which in turn is secured to a shaft I19 journaled at its ends in the rearward extensions of the casting I32. As will hereinafter be described, the shaft I19 is given a reciprocatory movement first in a counterclockwise direction and then in a clockwise direction once for each machine cycle. The above construction is such that when the shaft I19 is rocked counter-clockwise, the shaft E14 and consequently the arm I13 are rocked clockwise in a manner to rock the pawl I68 by means of the pin and slot connection Ill and I12, out of engagement with the teeth on the master gear I23.

The sun gear MI may be locked and unlocked by means including a lock gear I18 (see also Figs. 10 and 11) secured to the shaft I48 upon which is also secured the sun gear I4! as above described. Cooperating with the lock gear I18 is a pawl I80 pivoted upon a short stub shaft I8! secured to the left hand frame wall I80. The pawl 58% is provided with a cam slot I82 within which rides a .pin E83 secured to an arm I84 fixed to a shaft l85. The shaft 585 is journaled at its left hand end in the left hand frame wall I30 and at its right end in a depending bracket I86 secured by means of screws I81 to the casting I32. The means for rocking the shaft I85 and the arm I84 so as to move the pawl I into and out of engagement with the lock gear I18 is substantially the same as that previously described in connection with the pawl I58. Referring particularly to Figs. 2 and 10, the shaft I85 has securely mounted thereon a rearwardly extending arm I88 which is connected by means of link I90 to another arm I9I secured to the previously described shaft I19. The above construction is such that when the shaft I19 is rocked counter-clockwise during the first part of the machine cycle, the shaft I85 and consequently the arm I84 are rocked in a clockwise direction whereby the pin I83 00- operating with the cam slot I82 moves the pawl I80 into engagement with the teeth on lock gear I18, thereby locking the sun gear I4I against rotation. When the shaft I19 is rocked clockwise during the latter part of the cycle, the shaft I85 and arm I84 are rocked in a counter-clockwise direction moving the pawl I80 out of engagement with the look gear I18 rendering the sun gear I4I free to rotate. It will be noted that the construction of the above pawls i 58 and I80 is such that, during the entering part of the cycle, the pawl I 80 is always moved into engagement with the gear I18 slightly before the pawl I68 unlocks the gear I23 and, during the restoring part of the cycle, the pawl I68 always locks the gear I23 slightly before the pawl I80 unlocks the gear I18.

Cam unit Escapement cam mechanism Referring particularly to Figs. 1, 5, and 12, the escapement or spacing mechanism is under control of its associated spacing cam I and includes a roller 200 adapted to ride upon the periphery of said can. The roller 280 is rotatably mounted upon the forward portion of one arm of a lever 29! pivoted upon the cross shaft 92 which shaft is supported at its ends in the left and right hand walls of the typewriter frame I1. The rearward portion of the other arm of the lever 20I is forked at 2532 to embrace a pin 283 mounted upon an upwardly extending U-shaped arm 204. The lower portion of the arm 284 is loosely mounted upon a shaft 205 secured at its ends in left and right hand extensions 286 formed in a bracket 201 suitably secured to the innerside of the rear, wall of frame I1. A spring 288, one end of which bears against the lower side of bracket 20'! and the other end of which bears against a pin 2 It on the arm 204 serves to urge the arm 204 in a clockwise direction and consequently the roller 280 against the periphery of cam 595. An eccentric cross bar 222 adjustably secured to the left and right hand extensions 2S5 cooperates with a shoulder All on the arm 204 in a manner to limit the clockwise movement of said arm. The u per end of the arm 288 has loosely connected at 2i3 a forwardly extending link 254, the forward end of which is forked at 2 I 5 to receive a pin 2 I8 mounted on the lower portion. of. the well known escapement rocker element H1. The, above construction is. such that normally the roller 2% on thelever 253 Iv rides teen the low dwell of the cam' I95 whereby thearm 20 i is in its full. clockwise postion. Whenthe Cain unit IE4 is clutched to the continuously rotating powershaft I532, upon depression of a numeral hey 2ilas above described, the cam unit including cam I95 is rotatedv ina counter-clockwisedirection.

Referring particularly to Figs. 12 and 15, at about 245v rotationof the cam: I95, the roller. 2%

cooperating therewith begins to rise from the .low dwell ofthe .cam, and-through lever 2IlI,'.pin

2&3 andthe forkediportion 252 begins to rock the, .armizoa about its pivotl 2il5 against the-tension of its spring2t8. This :causes forward movement of the upper end-of the arm 284thereby moving :fhflllllk'llfl in asubstantiallyhorizontal direction wherebythrough the pinZI 6' and the forked ,portion 2I5, the rockereelement 2" is rocked to initiate-an. esoapement operation of the machine .in the ;well known-manner. ,At about,2'10 rotation ofthe cam' I95- theroller 2&0 begins to ride uponthe high dwell of thecam at which time 1 the armKZIM; through-thelever ZIlI'ds at'its full counter-clockwise position and the esoa-pement rocker elementv 2 I1- through the link 2 I :3 is at its fully operatedposition. At about-275 rotation oztthe cam-I95 the. roller ZIBIlthereonbegins to ride off the highdwellof theoam thereby beginning to restore the lever 26 I, the arm 2%, the link 2 I 4, and the rocker lemerit'z I1 to normal position.

,Atsabout 295'rotation"of.the cam I35 the lever '29!) thereonbegins to'ridezup'on the low dwell of r 1 the-cam at'which time all-of its cooperating elem'ents havebeen restored'to normal position.

, Locking and unlocking cam mechanism Referring to Figs. 1; 5, 8, 9, 10 and 11, the mech- -anism for moving pawls I58 and 18!! into and out of. locking engagement with the master gear I23 and lock gear I18 is undercontrol of the lock- .a piazza fixed tothe arm 22I. An upwardly extending toe224 formed on the arm' 22I is .adapted to cooperate. withthe cross bar 2I2 in a manner 2 to limit the. counter-clockwise movement of said 22 I. Pivotally mounted upon the shaft 205 is a .U-shaped arr-11 225 which is resiliently connected .to thearm 22I by means of a spring 226 having one end connected to a pin 221 on the arm 225 and the other endponnected to the pin 223. The U-shaped arm 225-extends upwardly and is connected at 22B'to a forwardlyextending link 23h which link is connected at 23! to a depending arm 2'32 fast ona cross shaft 233. The cross shaft 223 .is journaled at its ends in left and right hand brackets 234; (one sh0wn),see Fig. 1, secured to .the outer sides of the leftand right hand walls .of the frame I1 and has secured thereon a forwardly extending arm 235. The arm 235 is connected at 235 to the lower end of a vertical link $231, the upper end of which link is connected at 238 to an arm Z IIIsecured to the shaft I19 previously described in connection with the locking ,gagement with. the master gear I23.

engagement with the lock gear I18. recalled that,when the pawls I68 and mil-assume the above positions anamount may be entered rides upon the .low dwell of the cam I 96 whereby,

through the linkages justdescribed, the shafts I19 and 233-are in theirfull clockwise position. In

this position of the above mechanism, (see Fig. 8) the pawl Ittisinlocking engagement with the master gear I23 so as to prevent any accidental rotation of said gear during the time that the machine is idle or during the time that the machine operates for alphabet printing. Also, at this time,.the pawl I is out of locking engagement with the lock gear. I18 (see Fig.- 10).

Referring particularly to Figs. 8, 9, 10, ll, and

:15, when the cam unit I04 is clutched to the continuously rotating powershaft 552 as above described, the camunit including the locking and unlocking cam I96 is rotated in a counter-clockwise-direction. Immediately upon the beginning of the rotation of the cam I96, the roller 2.28

cooperating therewith begins to rise from the low dwell oi the cam torock its arm 22! in a clockwise direction againsttension of its spring arm 1235 fixed thereto moves in a downward direetion whereby, through 111111 231, the arm and consequently the shaft I19 is rocked in a counter-clockwise direction. vAs has been pre- .viouslydescribed, rocking of theshaft in a counter 'clookwise direction causes a corresponding clockwise rotation-,ofthe-shaft lid whereby the pin- Il2' on the arm I13,-:cooperating with the cam slot IN on the pawl I68, acts to rock the pawl IE8 about its pivot Ill! out of looking on Similarly, counter-clockwise rotationaof the shaft Eli: will causea corresponding clockwise rotation of the shaftzIfiiwhereby the pin' E83 on thearin IE5,

cooperating with the cam slot I82 on the pawl i813, acts to rock the pawl I80 about its pivot Isl into locking engagement with the lock gear 515. At about=60rotation of the cam- I96, the roller i525 begins to'ride upon thehigh dwell of the cam at -which time the shafts I19and 233 through their associated linkages above described are at their fullycounterclockwiseposition wherein the pawl =I68 (see Fig. 9) is rocked fully out of locking engagement withzthe master gear 523 and the pawl 88 (see Fig. 11) is rocked fully into locking It will be into the accumulator-additively:or subtractively,

as has: been previously-described. At about rotation of the'cam-QG the roller 223 begins to ride off the high dwell of the cam whereby shafts I 19 and 233 through their associated mechanisms above described begin to rock in a clockwise direction'to normal position. Clockwise rotation of theshaft' I19 causes the shaft I14 to rock in a counter-clockwise direction whereby the pin 12 on the arm I13 cooperating with the cam slot 15 in the pawl I68 rocks said pawl into locking en- 'gagernent with the master gear I23. Similarly, clockwise rotation of the shaft I15 causes c0untor-clockwise rotation of the shaft I55 whereby pin Seton theaarm I34 cooperating with slot I82 on the pawl I80 rocks said pawl out of locking engagement with the lock gear I18. At about 235 rotation of the cam I96 the shafts I19 and 238 are at their full clockwise position and the i'pawls I 68 and I80 are'fully. restored to normal positionwhereln the pawl IB81isin locking en- 3 gagement with the master gear I23 and the pawl I80 is out of locking engagement with the lock gear I28. It will be recalled that with the pawls I58 and lei! in the above position, the planetary gears M2 and the sun gear MI are restored to normal position without effecting rotation of the master gear I23.

Entering or add cam mechanism It has been previously described that downward movement of the links W2 and I54 causes the epicyclic gear train to actuate the master gear I23 in a manner to enter items either additively or subtractively in the accumulator, an amount corresponding to the numeral key depressed, and the upward movement of the links H52 and I54 acts to restore the epicyclic gear train to normal position without effecting rotation of the master gear I23.

Referring to Figs. 1, 5, 7 and 15, the mechanism for vertically moving the links I52 and I54 is under control of the entering or adding cam I9? and includes a roller 225 adapted to ride upon the periphery of said cam. The roller 245 is rotatably mounted upon an arm 246 pivotally mounted upon the shaft The arm 246 is resiliently urged in a counter-clockwise direction by means of a spring 247 one end of which bears against the bracket .29! and the other end of which bears against a pin 248 fixed to the arm 246. An upwardly extending toe 256 formed on the arm 2% cooperates with the cross bar H2 in a manner to limit the counter clockwise rotation of said arm. Pivotally mounted upon the shaft 2&5 is a U-shaped arm 25! which is resiliently connected to the arm 2% by means of a spring 252, one end of which is connected to the pin 2% and the other end of which is connected to a pin 253 on the arm 25!. The upper end of the arm 225i is connected at 254 to the rear end of a link 255 the forward end of which is connected at 255 to a depending arm 25! secured to a cross shaft 258. The cross shaft 258 is journaled at its ends in brackets 23 (one shown), see Fig. 1, and has secured thereto a forwardly extending 255 connected at let to the aforementioned. links I 52 and 54. The above construction is such that normally the roller 2% on the lever rides upon the low dwell of the cam I9! whereby the arm 2% and consequently the links I52 and i 54 are in their fully raised position.

Referring particularly to Figs. '7 and 15, at about 60 rotation of the cam itl, the roller 245 cooperating therewith begins to rise from the low dwell of the cam whereby through its associated linkage above described the shaft 258 and arm 265 are rocked in a counter-clockwise direction. This causes lowering of the links !52 and E54 and clockwise rotation of the arm I44 to effect an entry in the manner previously described. At about 175 rotation of the cam N1, the shaft 253 and arm 266 are in their fully counter-clockwise position and consequently the links I52 and I54 are in their fully lowered position at which time the entering operation has been completed. At about 235 rotation of the cam Iii? the'roller 245 begins to ride off the high dwell of the cam 19'! whereby the shaft 253 and arm 260 begin to rock in a clockwise direction and consequently the arms i? and 554 begin to rise. It will be recalled that during this upward movement of the links i522 and i5? the master gear 523 is locked against rotation and the lock gear IE8 is unlocked whereby the planetary gears E42 and the sun gear MI are restored to normal position without effecting rotation of the master gear I23. At about 285 rotation of the cam I91 the roller 245 begins to ride upon the low dwell of the cam whereby the links I52 and I54 and their associated mechanism are fully restored to normal position. It will be noted that the arms 22! and 246 associated with the locking and unlocking mechanism and the entering or add mechanism respectively are each provided with a further toe or extension 2M which with their associated arms 2 5 and 25! fit within a slotted portion 262 (see Figs. 1 and 5) formed in the comb plate 9I so as to prevent any lateral displacement of said arms.

Restoring cam mechanism It will be recalled that upon operation of any numeral key 28 (see Fig. 1) its associated slide 32 is released whereby said slide moves forwardly to bring its associated depending arms I53 and block H2 in cooperative relation with its associated differential arm Iti. Forward movement of the slide 32 will, through stud I0, rock the four arm lever 72 to initiate the operation of the printing mechanism and clutch the cam unit Hi5 with the continuously operating power shaft 5&2. It will be seen that as long as the slide is in its full forward position, the machine will function in continuous cycles. Means are therefore provided herein whereby the slide 32 is restored to its normal rearward position toward the end of each cycle of the machine so as to restore and bring to normal resting position its associated mechanisms.

Referring to Figs. 1, 5, 13 and 15, the means for restoring the slide 32 includes a cam I98 upon the periphery of which rides a roller 265 rotatably mounted upon an arm 256 pivotally mounted upon the shaft 55. The forward end of the arm 286 is forked at 25? to receive a pin 268 mounted upon a rearwardly extending arm 21a) which arm is secured to a cross shaft 2H. The shaft 2' is journaled at its ends in left and right hand brackets 212 (one shown), Fig. 1, secured to the inner sides of the left and right hand walls of the power base frame it and has secured thereto a pair of upright arms 273 connected at their upper ends by a cross bail 214. Each of the arms 2'53 have connected thereto one end of a spring 225, the other end of which spring is connected to the plate 36. The springs 215 serve to urge the shaft Eli in a counter-clockwise direction and consequently the roller 265 on arm 266 against the periphery of cam E98. Upon rotation of the cam I38 the cross bail 214 is adapted to first move r arwardly to restore all slides 32 to their normal position and subsequently move forwardly to permit forward movement of the slides 32 during the next entering operation of the machine.

It will be recalled that the slides 32 are retained their rearward or normal position against the tension of springs i l by means of the previously described pin 3i engaging the shoulder 30 (see Fig. In order to insure the restoration of the previously actuated slide 32 to its latched position, it i necessary to move said slide rearwardly a slight distance beyond its normal latched position so that the pin 2%! may properly engage the shoulder 3%? thus preventing recycling of the machine. To this end means are provided here-in to enable the overthrow rearwardly of only the actuated slide 32 without efiecting an overthrow of the remaining latched slides, which operation would necessitate a great deal of power to overcome the tension of the combined springs tact the extrusions 282.

44. Eeferringto; Figs. ,1 and l3,.;each"of the have .pivotedon the stud 19 a lever 2'56 .havingal dependingarmEl'i adapted to be en to be moved forwardly along the slot M when the rest ing bail 2Y2 moves forwardly to its normal pc Ltion.

The above construction is such that normally, i; e.,-when the restoring bail 21s is at its full forward position, all of the slides 32 are at their rearward latched position and the extrusions 232 of the slides 233 .are in contact withtheir associ ated low steps 28 as shown in Fig. 13. With the parts in the above position, the bail 214 may be moved rearwardly a full distance without effecting anyrearward movement of the slides 32 through their associated arms 21? on levers 2'55. Upon. operation of a numeral key 29 its corresponding slide 32 .moves forwardly, as above described, moving with it the lever 216 (see also Fig. it). limited by the casting 34, the lever 21%, moving forwardlywith the. slide 32, is rocked in a clockwise direction by the extrusion 282 until said extrusion contacts thehighstep 28I of the arm 2%. In this position of the parts (see 16) the lever lit-is in its full clockwise position and the arm 27? ismoved forward a distance beyond that of the arms 21? whose associated low steps 2% con- It will be seen that when the restoring bail 21s moves rearwardly to restore theactuated slidefiZ it will engage he arm 2?? and, due to the binding action caused by the engagement of the extrusion 232 .and the high step 285 will move the lever 216 and the slides 32 and 283 rearwardly a distance beyond the normal latched position of the other slides 32 without effecting movement of said other slides (see Fig.

17). At this time the pin 3| of the affected slide will assume a position slightly beyond the shoulder 39. During the first portion of the return movement of the bail 21 3 the slide 32, which was overthrown as above described, is permitted to move. forwardlya slight distance until its pin 3| engages the shoulder 39. At the same time, the bail 22 i picks up the depending arm 28d of the slide 283 and moves said slide forwardly along the slot 2! to its normal position wherein its extrusion again engages the low step 289.

Referring particularly to Figs. 13 and 15, the timing for moving the bail 2M rearwardly to restore the actuated slide 32 to its latched position and forwardly to normal position is such that at about 3 rotation of the cam I98 the roller 255 has compl ted its movement from the high dwell to the 'low' dwell of thecam during which time the bail. 214i is moved forwardly a slight distance. At

about 279 rotation of the cam I93 the roller 255 begins to rise from the low dwell of the cam to rock the arm 255 in a counter-clockwise direction and consequently the shaft 2II in a clockwise di rection. This causes rearward movement of the bail 22 5 to engage the depending arm 21! associated with the previously released slide and move said arm and slide rearwardly. At about 325 rotation of theicam I98 the roller 265 begins to ride As the forward movement of slide 283 is upon the high'rdwell of the cam. at which time the bail 274has? fully reached its rearward position and the slide has. been moved a distance beyond its normal'latched position. At about 336 'rotation 'of the cam I98, the roller2t5 begins to ride off the high dwell of the cam and the bail 2'54 begins to move forwardly to its normal position. It will be noted that shortly after the bail 215 begins its forward movement the previously released slide 32above referred to moves forwardly to its latched position. At the end of the machine cycle the resting portion of the roller 255 is about 3 from the low dwell of the .cam I98 to insure the disengagement of the dogs IOEI and clutch member IIII.

Summary of operations In. order to. set forth the sequence of the various functions of the present machine, the following is an illustrative example of the manner in which a numeral may be either entered into or subtracted from the accumulator. With the foregoing description of the invention in mind, let it be assumed that the machine is in its normal cleared position and it is desired to enter the numeral 7 v additively into the accumulator. The credit balance reversing mechanism is set in the manner set forth in the above mentioned Wahl patent to engage one of the gears I25 with the internal gear I45 (see Figs. 1, 2, and 8) so that clockwise rotation of saidgear Hi5 will cause a corresponding rotation of the master gear I23 in an add direction. With the machine conditioned as above, the 7 numeralkey 29 is depressed, which as'above' described releases its associated slide 32 to cause saidslide to move forwardly under the influence of its spring at. Immediately upon the release of the slide 32 the cam portion 5? thereon cooperating with the pin 58 causes actuation of the key lock mechanism to prevent operation of a second numeral key 26. At the same time the slot I66 of the slide 32 picks up its associated stud I65 to'rock its associated depending arms I63 clockwise about the shaft I64 to a position whereby the stop block I62 is brought directly in vertical alignment with and into the path of movement of its associated differential arm ISI. Shortly after the release of the slide 32 the stud I0 thereon engages the arm II of lever I2 to rock the lever clockwise to cause engagement of the snatch pawl I5 with the snatch roll It to print the numeral '7 and also to cause rearward movement of the bail 83 and link 85 thereby connecting the cam unit I64 with the continuously rotating shaft I92. When the cam unit I9 5 is thus connected with the shaft I02 the spacing cam I95, the add cam I91, the lock cam I96 and the restoring cam I98 will make one complete revolution to actuate their associated mechanism whereby the machine may perform the various functions as above described. The first of the above functions performed by the machine upon connecting the cam unit IIM-with the shaft I02 is that of enabling cam I96 to actuate the locking awls its and IE9 .in .a manner. to unlock the master gear 523 and lock sun gear MI: in preparation for making an entry into the accumulator. The second of the above functions takes place shortly after the masated stop :block. I62, the-downward movement in thisin'stance being such that the master gear I13 is rotated a distance sufii'cient to enter only '7 in the accumulator. The third'of'the above functions takes place shortly after the entry of 7 has been made in the accumulator at which time the spacing cam I95 is eifective to initiate a spacing operation of the machine. The 4th and last of the above functions takes place toward the end of the machine cycle'and after the above cams I95, I96, and I91 have restored their associated mechanisms to normal position at which time the restoring cam I98 is effective to actuate the restoring bail 214 to restore the actuated slide and its associated mechanism back to normal position. It will be noted that all of the above functions initiated upon the depression of a numeral key take place substantially in one complete cycle of the machine. In a similar manner it will be seen that upon depression of any one of" the numeral keys 20' the number corresponding to the numeral key depressed maybe entered in the accumulator additively. Should it be' desired to enter an amount inthe accumulator negatively, it is merely necessary toset the credit balance reversing mechanism in amanner" to disengage the gears I from the internal gear I" and engage the pinion I27 with the internal gear I45 so that clockwise rotation of said gear I45 as above described will cause a corresponding rotation of the master gear I23 in a subtractdirection.

While we have described what we consider to be a highly desirable embodiment of our invention, it. is obvious that many changes in form could be made without departing from the spirit of our. invention, and we, therefore, do not limit ourselves to the exactform herein shown and described, nor to anything less than the whole of our invention. as hereinbefore set forth and as hereinafter claimed.

What we claim as new and desire to' secure by' Letters Patent is z 1.. In a machine. of the class described, numeral keys, a snatch roll printing mechanism, a centimuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an: epicycli'c gear train normally in continuous driving connection with the master wheel, connections extending from the control unit for driving the gear train, and means operable upon depression of any of said. numeral keys for connecting the control unitwith the power shaft and initiating the operation of. the snatch roll printing mechanism..

2. In a machine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating power shaft, a control unit normally disconnected from but associated with the train normally in continuous driving connection with the master wheel, connections extending from the control unit for driving the gear train, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

3. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel and for concurrently unlocking and locking parts of the gear power shaft, a master wheel, an epicyclic gear T8 train, means also extending from the control unit for driving the gear train around its axis, and means operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

4. In a machine ofthe class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel and for concurrently unlocking and locking parts of the gear train, connections also extending from the control unit for driving the gear train around its axis, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

5. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train normally in continuous driving connection with the master wheel, connections extending from the control unit for' looking and unlocking the master wheel and for concurrently unlocking and locking parts of the gear train, connections also extending from thecontrol unit for driving the gear train around its axis, means associated with the numeral keysfor limiting the movement of said driving connections, and means operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

6. In a machine of the class described, numeralkeys, a snatch roll printing mechanism, a continuously rotating power shaft, a controlunit;

normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary'gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel alternately with the sun gear, connections also extending from the control unit for driving the gear train, and means operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

7. In a machine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating powershaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train comprising an internal gear, planetary gears and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extendingfrom the control unit for locking and unlocking the master wheel alternately with the sun gear, connections also extending from the control unit for driving the gear train, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

8. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gearnormally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel, connections also extending from the control unit to the planetary gears for driving the gear train when the master wheel is unlocked, and means operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

9. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extendin from the control unit for locking and unlocking the master wheel, connections also extending from the control unit to the planetary gears for driving the gear train when the master wheel is unlocked, and a slide mechanism operable under depression of any of said numeral keys for connecting the control unit with the power shaft.

10. In a machine of the class described, nu-

meral keys, a snatch roll printing mechanism a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from the control unit to the planetary gears for driving the gear train, and means operable upon depression of any of said numeral keys for com necting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

11. In a machine of the class described, numeral keys, a snatch roll printing mechanism a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from the control unit to the planetary gears for driving the gear train, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

12. In a machine of the class described, numeral keys, a snatch roll printing mechanism a continuously rotating power shaft, a control unit' normally disconnected from but associated with the power shaft, a master wheel, an epicyclic geartrain normally in continuous driving connection with the master Wheel, connections extending from the control unit for driving the gear train, means associated with the numeral keys for limiting the movement of said driving connections, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

13. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears and a. sun gear, the said internal gear normally in continuous driving connection with the master wheel, connectlons extending from the control unit for locking and unlocking the master wheel alternately with the sun gear, connections also extending from the control unit for driving the gear train when the sun gear is locked, and means operable upon depression of any or said numeral keys for connecting the control unit with the power shaft.

14. In a machine of the class described, numeral keys, a continuously rotating power shaft, a control unit normally disconnected from but associated With the power shaft, a master wheel,

' an annular epicyclic gear train comprising an internal gear, planetary gears and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel alternately with the sun gear, connections also extending from the control unit for driving the gear train when the sun gear is locked, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

15. In a machine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating power shalt, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel alternately with the sun gear, connections also extending from the control unit for driving the gear train when the master wheel is unlocked and for restoring the driving means when the sun gear is unlocked, and means operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

16. In amachine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating power shalt, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, a pawl for locking and: unlocking the master wheel, a pawl for locking and unlocking the sun gear, connections extending from a cam on the control unit for alternately locking and unlocking the pawls, connections extending from another cam on the control for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

1'7. In a machine of the class described, a nu- V meral key, a master wheel, a continuously rotating power shaft, an annular epicyclic geartrain comprising a sun gear, a planet gear, and an internal gear, the internal gear normally in continuous driving connection with the master wheel, a cam unit normally disconnected from but associatedwith the power shaft, a pawl for locking and unlocking the master wheel, a pawl for locking and unlocking the sun gear, connections extending respectively between one of the cams in the unit and the pawls and between another of the cams in the unit and the planet gear, the connections adapted to engage the pawl with the sun gear when the master wheel pawl is disengaged and vice versa as well as to drive the planet gear, and means actuated by the operation of the key and associated with the cam unit to connect the cam unit with the power shaft.

18. In a machine of the class described, a numeral key, a master wheel, a continuously rotating power shaft, an annular epicyclic gear train comprising a sun gear, a planet gear, and an internal gear, the internal gear normally in continuous driving connection with the master wheel, a cam unit normally disconnected from but associated with the power shaft, a pawl for locking and unlocking the master wheel, a pawl for locking and unlocking the sun gear, conneotions extending respectively between one of the cams in the unit and the pawls and between another of the cams in the unit and the planet gear, the connections adapted to engage the pawl with the sun gear when the master wheel pawl is disengaged and vice versa as well as" to drive the planet gear, a slide actuated by the operation of the key, and means operated by the movement of the slide and associated with the cam unit to connect the cam unit with the power shaft.

19. In a machine of the class described, nu-

meral keys, a continuously rotating power shaft,

a cam unit normally disconnected from but ass'ociated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, a pawl for locking and unlocking the master wheel, a pawl for locking and unlocking the sun gear, connections extending from a cam in the cam unit for alternately locking and unlocking the pawls, connections extending from another cam in the cam unit to the planetary gears for driving the gear train when the master wheel is unlocked and for restoring the planetary gears when the sun gear is unlocked, a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft.

20. In a machine of the class described, numeral keys, a snatch roll printing mechanism a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, connections extending from a cam in the control unit for al ternately locking and unlocking the master wheel and sun gear, the sun gear forming a fixed axis for the gear train when the master wheel is unlocked and an idle axis when the master wheel is locked, connections extending from another cam in the control unit to the planetary gears for driving the gear train when the sun gear is fixed and for restoring the planetary gears when the sun gear is idle, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

21. In a machine of the class described, numeral keys, a continuously rotating power shaft, a; control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclio gear train normally in continuous driving connection with the master wheel, connections extending from a cam in the control unit for locking and unlocking the master wheel and for concurrently unlocking and locking parts of the gear train, connections extending from another cam in the control unit to the planetary gears for driving the gear train around its axis, differential elements associated with the driving connections, blocking means for limiting the movement of said driving connections, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and for moving the blocking means into the path of the said driving connections.

22. In a machine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an epicyclic gear train normally in continuous driving connection with the master wheel, connections extending from the control unit for locking and unlocking the master wheel, the said connections also operable for fixing the axis of the gear train when the master wheel is unlocked and vice versa, connections also extending from the control unit for driving the gear train around the fixed axis, and a slide mechanism operable upon depression of any of said numeral keys for connecting the control unit with the power shaft and initiating the operation of the snatch roll printing mechanism.

23. In a machine of the class described, numeral keys, a snatch roll printing mechanism, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving connection with the master wheel, a pawl operable to lock and unlock the master wheel, a pawl operable to lock and unlock the sun gear, connections extending from the control unit for effecting operation of said pawls to alternately lock and unlock said sun gear and master wheel, connections also extending from the control unit to the planetary gears for driving the gear train when the master wheel is unlocked and for restoring the planetary gears when the sun gear is unlocked, differential elements movable with the driving connections, blocking means for limiting the movement of said differential elements, and a slide mechanism operable upon depression of any of said numeral keys for effecting the connection of the control unit with the power shaft, the moving of the blocking means into effective position, and the actuating of the snatch roll printing mechanism.

24. In a machine of the class described, nu meral keys, a snatch roll printing mechanism, a continuously rotating power shaft, a control unit normally disconnected from but associated with the power shaft, a master wheel, an annular epicyclic gear train comprising an internal gear, planetary gears, and a sun gear, the said internal gear normally in continuous driving con- 

